/**
    * This file Copyright (c) 2012-2016 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.ui.vaadin.gwt.client.widget;
  
  import info.magnolia.ui.vaadin.gwt.client.editor.jsni.AbstractFrameEventHandler;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.dom.client.Element;
  import com.google.gwt.dom.client.Style;
  import com.google.gwt.event.dom.client.LoadEvent;
  import com.google.gwt.event.dom.client.LoadHandler;
  import com.google.gwt.user.client.ui.Composite;
  import com.google.gwt.user.client.ui.SimplePanel;
  import com.google.gwt.user.client.ui.Widget;
  import com.google.web.bindery.event.shared.EventBus;
  import com.vaadin.client.BrowserInfo;
  import com.vaadin.client.ComputedStyle;
  
  /**
   * GWT implementation of MagnoliaShell client side (the view part basically).
   */
  public class PageEditorViewImpl extends Composite implements PageEditorView {
  
      public static final String PAGE_EDITOR_CLASS_NAME = "pageEditor";
  
      private Listener listener;
  
      private PageEditorFrame iframe = new PageEditorFrame();
  
      private String url;
  
      private SimplePanel content;
  
      private AbstractFrameEventHandler handler;
      private int lastScrollPosition;
  
      public PageEditorViewImpl(EventBus eventBus) {
          super();
          this.handler = GWT.create(AbstractFrameEventHandler.class);
          this.content = new SimplePanel();
          handler.setView(this);
          handler.setEventBus(eventBus);
          content.setWidget(iframe);
          initWidget(content);
          setStyleName(PAGE_EDITOR_CLASS_NAME);
  
          final Element iframeElement = iframe.getElement();
          iframeElement.setAttribute("width", "100%");
          iframeElement.setAttribute("height", "100%");
          iframeElement.setAttribute("allowTransparency", "true");
          iframeElement.setAttribute("frameborder", "0");
  
          iframe.addLoadHandler(new LoadHandler() {
  
              @Override
              public void onLoad(LoadEvent event) {
                  iframe.removeStyleName("iframe-preloader");
              }
          });
  
          handler.init();
          if (BrowserInfo.get().isIE8()) {
              registerPageEditorIframe(iframeElement);
          }
      }
  
      private native void registerPageEditorIframe(Element iframeElement) /*-{
          $wnd.__page_editor_iframe = iframeElement;
     }-*/;
 
     @Override
     public PageEditorFrame getFrame() {
         return iframe;
     }
 
     @Override
     public Widget getContent() {
         return content;
     }
 
     @Override
     public void setListener(Listener listener) {
         this.listener = listener;
     }
 
     @Override
     public void setUrl(String url) {
         getFrame().setUrl(url);
         this.url = url;
     }
 
     @Override
     public void reload() {
         handler.reloadIFrame(iframe.getElement());
     }
 
     /**
      * The position is updated by {@link AbstractFrameEventHandler#initScrollListener(Element)} using a scroll event handler.
      */
     @Override
     public void setLastScrollPosition(int lastScrollPosition) {
         this.lastScrollPosition = lastScrollPosition;
     }
 
     /**
      * Resets the scroll-position to the latest known one. This is used to keep the position between page changes and also to work-around some browser
      * defects resetting the scroll position to '0' when selecting elements (components/areas) in the page.
      */
     @Override
     public void resetScrollTop() {
         if (BrowserInfo.get().isTouchDevice()) {
             getFrame().getElement().getStyle().setHeight(getFrame().getBody().getOffsetHeight(), Style.Unit.PX);
             new ComputedStyle(getFrame().getElement());
         }
         content.getElement().setScrollTop(lastScrollPosition);
     }
 
     @Override
     public void initDomEventListeners() {
         if (BrowserInfo.get().isTouchDevice()) {
             handler.initNativeTouchSelectionListener(iframe.getBody(), listener);
         } else {
             handler.initNativeMouseSelectionListener(iframe.getElement(), iframe.getBody(), listener);
         }
         handler.initNativeKeyListener(iframe.getElement());
         handler.initScrollListener(content.getElement());
     }
 
     @Override
     public void initKeyEventListeners() {
         handler.initNativeKeyListener(iframe.getElement());
     }
 
 }